BoostingTermQuery performance
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Key: LUCENE-1017
URL: https://issues.apache.org/jira/browse/LUCENE-1017
Project: Lucene - Java
Issue Type: Improvement
Components: Search
Affects Versions: 2.2
Environment: all
Reporter: Peter Keegan
I have been experimenting with payloads and BoostingTermQuery, which I think
are excellent additions to Lucene core. Currently, BoostingTermQuery extends
SpanQuery. I would suggest changing this class to extend TermQuery and refactor
the current version to something like 'BoostingSpanQuery'.
The reason is rooted in performance. In my testing, I compared query throughput
using TermQuery against 2 versions of BoostingTermQuery - the current one that
extends SpanQuery and one that extends TermQuery (which I've included, below).
Here are the results (qps = queries per second):
TermQuery: 200 qps
BoostingTermQuery (extends SpanQuery): 97 qps
BoostingTermQuery (extends TermQuery): 130 qps
Here is a version of BoostingTermQuery that extends TermQuery. I had to modify
TermQuery and TermScorer to make them public. A code review would be in order,
and I would appreciate your comments on this suggestion.
Peter
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